.slider {
    width: 100%;
    height: 16px;
    font-size: 16px;
    margin: 2px;
    background-color: #337ab7;
    // box-sizing: border-box;
    span {
        width: 16px;
        height: 16px;
        color: #fff;
        border-radius: 50%;
    }
}